They are VERY expensive but my Dad uses an engine driven compressor
and a cold plate on his boat for his refrigeration. They run the
engine once a day to "charge" the cold plate and it keeps their
(admittedly better insulated than a westy fridge) ice box cold all
day:

http://www.seafrost.com/ed.htm

I have often wondered about getting a system like this to supplement
westy cooling, or if you could even take a line of the AC compressor
to "charge" the cold plate.

Chris

On 11/15/05, Tim Demarest <tim.demarest@pobox.com> wrote:
> Any info on how long those typically lasted? DO these crew vehicles stay on
> the road as long as the typical westie?
>
>
> At 12:59 PM 11/14/2005 -0800, Jake de Villiers wrote:
> >You can make a very tight and well-insulated ice box with 2" blue styrofoam,
> >Pl 200 to glue it together and a couple of coats of epoxy to harden and seal
> >the interior. Made a few back in my movie days to outfit crew vehicles. I
> >didn't add refrigeration equipment, but I don't see why you couldn't.
>